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Grundig VS 680 VPT Serviceanleitung Seite 111

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9. Burstphase
Oszilloskop:
Gerateeigenen
Burstamplituden von 2 aufeinanderfolgenden
S-VHS-Buchse OUT | Testbildgenerator
Zeilen auf gleiche Amplitude einstellen.
Kontakt 4
einschalten
Trigger: CIC 1700-(8)
Adjustment
Preparation
Cassette
Adjust with
Adjustment Procedure
Operation mode
1. 627 kHz oscillator
| Connect CIC 1430-
| Record
R 1685
Set frequency to 15625 Hz.
(15) to +5V.
Disconnect IC 1430-(15) from +5V.
Frequency counter:
CIC 1430-(23)
2. Chroma record
Feed in a red area
VHS Record
R 1595
test signal
Oscilloscope:
300 mV
Plug contact S 6-11
PP
Trigger: S 6-1 (Sync)
10 ps/em
current
Frequency counter:
en
il
C 1637
Set frequency to 4,483619 MHz +5Hz.
CIC 1430-(31)
3. 8,8 MHz oscillator
4. Symmetry
Oscilloscope:
incall
R 1375
CIC 1480-(15)
(Colour bar test
Trigger: S 6-1 (Sync) | signal)
Maximum
Connect CIC 1480-
| Playback a selfmade
R 1450
R 1460
CIC 1355
(MN 3802 AS)
.
10 ps/em
|
(12) to chassis.
record (red area test
Oscilloscope:
signal)
5. 627 kHz comb filter
Minimum
CIC 1480-(3)
Trigger: S 7-6 (HI)
2 ms/cm
Disconnect CIC 1480-(12) from chassis.
Playback a selfmade
record (red area test
signal)
Oscilloscope:
CIC 1480-(5)
Trigger: S 7-6 (HI)
6. Symmetry
IC 1380
(MNM 6987)
correct
Correct
hcorrect
Playback a MESE-
CAM record
7. SECAM Identifica-
tion
Oscilloscope:
CIC 1700-(16)
Trigger: CIC 1700-(8)
Correct
licerrect
8. Colour Coincidence | Input a 20T/2T test
Record a S-VHS
pattern signal
cassette in S-VHS
Oscilloscope:
mode
EURO-AV 1-(19)
Playback this record
Trigger: S 6-1
Record a VHS cas-
sette in VHS mode
Playback this record
Record in VHS mode
on a S-VHS cassette
Playback this record
Correct
Incereact
Switch on the
integrated test signal
generator
Adjust the burst of two succesive ling to the
same amplitude.
Oscilloscope:
S-VHS-socket OUT
Contact 4
Trigger: CIC 1700-(8)
9. Burst phase
123

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